Six people are now unaccounted for in Larimer County after a productive weekend by search crews working in the aftermath of this month’s disastrous flooding, the sheriff’s office says.

U.S. Sen. Mark Udall stopped in Loveland on Sunday to meet with elected officials and local residents on a three-stop tour of Northern Colorado relief centers.

On the heels of Udall’s visits, Vice President Joe Biden is also set to come to Colorado on Monday, where he’ll survey the damage and recovery efforts before making remarks with Gov. John Hickenlooper in Greeley.

“It’s important we all stand together,” Udall said Sunday at the Larimer County Disaster Recovery Center and regional donation center. “I just marvel at the way in which people have come together and found a common cause. It’s America at its best. It’s Colorado at its best.”

Udall said he plans on using the information he learned during his visits Sunday to continue make sure all federal resources are made available to those who need them as quickly as possible.

“I’ll also carry these stories back to Washington,” he said, calling them “powerful,” “compelling” and “inspiring.”

The Larimer County Sheriff’s Office reported Sunday night on Twitter that six people remained unaccounted for in the county. That number was, at its highest, around 350. Three people are presumed dead.

After 16 people were rescued Saturday, the total number of people safely evacuated from flooded areas now totals 1,212, said sheriff’s spokesman John Schulz said. Several dogs, fish, a snail, turtle, tarantula and cat also were rescued, he added.

Udall toured the centers Sunday, speaking with families, volunteers and flood victims from the Storm Mountain and Cedar Cove areas.

He also sat down with officials from FEMA and the Red Cross, who heralded the organization and cooperation of officials from the state, local and federal levels who have worked together to make relief centers like Larimer County’s run smoothly.

“When a government works like this, we’re all better for it,” Udall said after the meeting.

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“In a way, I wish we weren’t all here like this but if Mother Nature is going to come at us as hard as she did, we’re responding in an appropriate and inspiring way,” he added. “It’s pretty amazing, from the stories to the resources to the help that’s going to be made available. I just hope there isn’t any more loss of life.”

The American Red Cross has seen the number of individuals staying at the six open Red Cross shelters in Northern Colorado decrease from more than 1,000 at first to around 200 Saturday.

Adam Rae, a public information officer for Northern Colorado Red Cross said the organization has aimed to keep the Fort Collins shelter at Timberline Church open until Saturday but will stay open “as long as we need to be.”

Heading off to the Weld County Disaster Recovery Center in Greeley, Udall commended Coloradans on how they’ve handled the recent devastation.

“We’ve had a tough year,” he said. “We had the shooting in Aurora last summer, we had the fires last summer, fires this summer. We’ve been through a drought, now we have biblical floods and it just further strengthens my resolve to lead our delegation to get all the federal resources to which we’re entitled.”